PHILADELPHIA (CBS) – Philadelphia 76ers guard Markelle Fultz being diagnosed with a little heard of disorder has many asking — what is it and is it real? Thoracic Outlet Syndrome is a syndrome that causes pain and weakness around the neck, shoulder and arm.

The 76ers say that’s what has been wrong with Fultz.

People who have it say it can be debilitating. Melissa Fairfield has Neurogenic Thoracic Outlet Syndrome, where nerves and blood vessels in the neck, upper chest and shoulder are impinged.

“This is as far as it goes up,” said Fairfield. “It just shoots pain down your arm.”

Fultz, the 2017 first overall pick, has been diagnosed with the same thing.